Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Rhombohedral.
from The Century Dictionary.
- Pertaining to a trigon; having the form of a trigon; triangular.
- In entomology, triangular in cross-section; having three long edges; trihedral; prismatic: as, trigonal antennæ; trigonal joints.
- In botany, same as
trigonous . - In anatomy, noting a triangular space at the base of the bladder. See
trigonum . - noun In anatomy, the triangular space at the base of the bladder; the trigonum.
from the GNU version of the Collaborative International Dictionary of English.
- adjective Having three angles, or corners; triangular.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective
symmetrically triangular
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adjective having threefold symmetry
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
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Examples
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Both have identical major ion chemistry CaCO3 but different structures: calcite is trigonal whilst aragonite is orthorhombic.
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-- Here there is rotation of one portion with respect to the other through 180° about the principal (trigonal) axis, which is perpendicular to the plane c (111); or the same result may be obtained by reflection across this plane.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various
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Horns very large, depressed and sub-trigonal at the base, attached to the highest line of the frontals, inclining upwards and backwards, conical towards the tip and bending upwards; muffle large, square.
Natural History of the Mammalia of India and Ceylon Robert Armitage Sterndale 1870
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The horns are trigonal, laterally compressed and knotted on the upper edge.
Natural History of the Mammalia of India and Ceylon Robert Armitage Sterndale 1870
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[VENUS LATILIRATA] Shell sub-trigonal, thick and ponderous for its size; ribs fine, concentric, and very thick; irregularly stirate, crenulate upon the lower margin; umbo slightly flattened.
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"The general form is trigonal, or wedge form, valves closed, front produced, posterior short; margins usually crenulated; hinge teeth 2 -- 2; laterals 1 -- 1 in each valve; pallial sinus deep."
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Moreover, some evidence suggests a cardiomyogenic differentiation capacity of MPCs, revealing the capacity to generate quadri - or trigonal cells positive for α-actinin and troponin I (data not shown).
PLoS ONE Alerts: New Articles Simone Pacini et al. 2010
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Pure corundum is a colorless, trigonal crystal with a hardness between that of emerald and diamond.
unknown title 2009
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The newest - and possibly the best - blue pigment in world history was born, due to manganese ions being structured in an unusual "trigonal bipyramidal coordination" in the presence of extreme heat.
innovations-report 2009
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Hornberg A, Tunemalm AK, Ekstrom F (2007) Crystal structures of acetylcholinesterase in complex with organophosphorus compounds suggest that the acyl pocket modulates the aging reaction by precluding the formation of the trigonal bipyramidal transition state.
PLoS ONE Alerts: New Articles Yuan-Ping Pang et al. 2009
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